Method for producing a stabilizer composition, and stabilizer composition produced using said method

Abstract

A method for producing a stabilizer composition for a polymer and a stabilizer composition produced by the method. At least one carboxylic acid is reacted with at least one metal compound, such as at least one metal hydroxide and/or at least one metal oxide and/or at least one metal carbonate, thereby forming a metal carboxylate of the carboxylic acid. The reaction of the carboxylic acid with the metal compound is carried out in a continuous manner in an extruder while reaction water being formed is discharged out of the extruder.

The invention claimed is: 
     
       1. A method for producing a stabilizer composition for a polymer, the method comprising:
 reacting in an extruder at least one carboxylic acid with at least one metal compound in a continuous manner, thereby forming a metal carboxylate of the carboxylic acid and reaction water in a continuous manner, and 
 discharging the reaction water being formed out of the extruder through openings arranged on an outer side of the extruder along the flow of material prior to where the stabilizer composition exits the extruder. 
 
     
     
       2. The method according to  claim 1 , wherein the carboxylic acid is fed into the extruder in liquid form. 
     
     
       3. The method according to  claim 2 , wherein the carboxylic acid is fed into the extruder at a temperature of more than 75° C. 
     
     
       4. The method according to  claim 1 , wherein a catalyst is supplied for reacting the carboxylic with the metal compound. 
     
     
       5. The method according to  claim 4 , wherein a weight ratio of carboxylic acid to catalyst is selected in the range from more than 0 to 50. 
     
     
       6. The method according to  claim 1 , wherein the reaction of the carboxylic acid with the metal compound is carried out in multiple cascaded modules of the extruder. 
     
     
       7. The method according to  claim 6 , wherein the modules are temperature-controlled in an at least partially separate manner. 
     
     
       8. The method according to  claim 6 , wherein a temperature of the modules is set such that the carboxylic acid is kept in a liquid state. 
     
     
       9. The method according to  claim 6 , wherein a temperature of the modules is set to at least 50° C. 
     
     
       10. The method according to  claim 1 , wherein the reaction of the carboxylic acid with the metal compound is carried out in multiple cascaded modules of the extruder and/or in that additional materials are incorporated into the stabilizer composition in one or more additional modules. 
     
     
       11. The method according to  claim 10 , wherein the additional modules are temperature-controlled at least partially separately from one another. 
     
     
       12. The method according to  claim 7 , wherein one or more conveying means in the modules are driven via a single motor. 
     
     
       13. The method according to  claim 1 , wherein a planetary roller extruder is used. 
     
     
       14. The method according to  claim 13 , wherein a central spindle of the planetary roller extruder is internally temperature controlled. 
     
     
       15. The method according to  claim 1 , wherein the stabilizer composition is removed from the extruder as a strand. 
     
     
       16. The method according to  claim 1 , wherein the stabilizer composition is granulated.